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Spurious Low Velocity Zones in Joint Inversions of Surface Waves and Receiver Functions
published November 24, 2019
posted in Research

Spurious Low Velocity Zones in Joint Inversions of Surface Waves and Receiver Functions

Low-velocity layers within the crust can indicate the presence of melt and lithologic differences with implications for crustal composition and formation. Seismic wave conversions and...

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First Tomographic Model of the Inner Core!
published November 24, 2019
posted in Research

First Tomographic Model of the Inner Core!

With collaborators Scott Burdick at Wayne State University and Lauren Waszek at New Mexico State University -- both former Maryland postdocs -- we just published...

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Improved Model of Outer Core 1D Structure
published July 10, 2018
posted in Research

Improved Model of Outer Core 1D Structure

We have published a new model of 1D structure of the outer core, parameterized using two different equations of state: Irving_Cottaar_Lekic_2018 Brief highlights: We infer the...

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Quaking the Delaware
published February 13, 2018
posted in News, Research

Quaking the Delaware

Graduate students at the University of Maryland Seismology Lab sprung into action following the M4.1 earthquake that struck Dover, Delaware on November 30, 2017. The...

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Things to consider when interpreting Sp receiver functions…
published October 4, 2017
posted in Research

Things to consider when interpreting Sp receiver functions…

Conversions of shear waves (S) to compressional waves (P), often analyzed as Sp receiver functions, are useful for studying upper mantle layering, and have been...

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About those amplitudes…
published October 4, 2017
posted in Research

About those amplitudes…

It is well known, at least among tomographers, that our images of the Earth's interior are washed out. Lateral variations in seismic velocities are likely...

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Improvement in P-wave tomography due to EarthScope
published October 4, 2017
posted in Research

Improvement in P-wave tomography due to EarthScope

The EarthScope project has been described as the Apollo program of the solid Earth community. It has enabled an unprecedented investment in seismic instrumentation, and...

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Reference Model of LLSVP Morphology
published October 15, 2016
posted in Research

Reference Model of LLSVP Morphology

Using depth-dependent clustering analysis of global Vs and Vp tomographic models, we have constructed a new reference model for LLSVP shape and volume. We obtain...

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3D Reference Earth Model
published July 13, 2016
posted in Research

3D Reference Earth Model

REM-3D is a project funded by the National Science Foundation and carried out by Raj Moulik, Ved Lekic, Barbara Romanowicz, and Adam Dziewonski. If you have...

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Viscosity increase in the Earth’s mid mantle
published February 14, 2016
posted in Research

Viscosity increase in the Earth’s mid mantle

Together with collaborators Max Rudolph at Portland State University and Carolina Lithgow-Bertelloni at University College London, we used a novel inversion framework to detect the...

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